eSaral - JEE | NEET | Class 8-10 Exam Prep App

The increasing order of boiling points of the following compounds is :

Question: The increasing order of boiling points of the following compounds is : $\mathrm{I}\mathrm{IV}\mathrm{III}\mathrm{II}$IV $$ I $$ II $$ III$\mathrm{I}\mathrm{III}\mathrm{IV}\mathrm{II}$$\mathrm{III}\mathrm{I}\mathrm{II}\mathrm{IV}$Correct Option: 1, Solution: Increasing order of boiling point is : $\Rightarrow$ Shows hydrogen bonding from $-\mathrm{O}-\mathrm{H}$ group only $\Rightarrow$ Shows strongest hydrogen bonding from both sides of $-\mathrm{OH}$ group as well as $-\mathrm{NO}_{2}...

The correct statement about probability density (except at infinite distance from nucleus) is :

Question: The correct statement about probability density (except at infinite distance from nucleus) is : It $\mathrm{cn}$ be negative for $2 \mathrm{p}$ orbitalIt can be zero for $3 \mathrm{p}$ orbitalIt can be zero for $1 \mathrm{~s}$ orbitalIt can never be zero for $2 \mathrm{~s}$ orbitalCorrect Option: , 2 Solution:...

The species that has a spin only magnetic moment of 5.9 BM, is -

Question: The species that has a spin only magnetic moment of $5.9 \mathrm{BM}$, is -$\mathrm{Ni}(\mathrm{CO})_{4}\left(\mathrm{~T}_{\mathrm{d}}\right)$$\left[\mathrm{MnBr}_{4}\right]^{2}-\left(\mathrm{T}_{\mathrm{d}}\right)$$\left[\mathrm{NiCl}_{4}\right]^{2}-\left(\mathrm{T}_{\mathrm{d}}\right)$$\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ (square planar)Correct Option: , 2 Solution: (2) $\left[\mathrm{MnBr}_{4}\right]^{2}-\left(\mathrm{T}_{\mathrm{d}}\right)$...

The one that is NOT suitable for the removal of permanent hardness of water is :

Question: The one that is NOT suitable for the removal of permanent hardness of water is : Treatment with sodium carbonateCalgon's methodClark's methodIon-exchange methodCorrect Option: , 3 Solution: Temporary hardness of water is removed by clark method and boiling. While permanent hardness of water is removed by treatment with sodium carbonate $\left(\mathrm{Na}_{2} \mathrm{CO}_{3}\right)$, calgons method and ion-exchange method...

The variation of molar conductivity with concentration of an electrolyte (X) in aqueous solution is shown in the given figure.

Question: The variation of molar conductivity with concentration of an electrolyte (X) in aqueous solution is shown in the given figure. The electrolyte $\mathrm{X}$ is : $\mathrm{CH}_{3} \mathrm{COOH}$$\mathrm{KNO}_{3}$$\mathrm{HCl}$$\mathrm{NaCl}$Correct Option: 1 Solution: Its a weak electrolyte hence : $\mathrm{CH}_{3} \mathrm{COOH}$...

Consider the Assertion and Reason given below.

Question: Consider the Assertion and Reason given below. Assertion (A) : Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins. Reason (R): High density polymers are closely packed and are chemically inert. Choose the correct answer from the following :(A) is correct but (R) is wrong.(A) and (R) both are wrong.Both (A) and (R) are correct and (R) is the correct explanation of (A).Both (A) and (R) are correct but (R) is ...

Kraft temperature is the temperature

Question: Kraft temperature is the temperaturebelow which the formation of micelles takes place.below which the aqueous solution of detergents starts freezing.above which the formation of micelles takes place.above which the aqueous solution of detergents starts boiling.Correct Option: , 3 Solution: (3) above which the formation of micelles takes place....

The number of chiral carbon(s) present in peptide, Ile-Arg-Pro, is

Question: The number of chiral carbon(s) present in peptide, Ile-Arg-Pro, is Solution: Ile-Arg-pro Ile - pro-Arg. Arg - Ile - pro. Arg - pro - Ile...

The major products of the following reaction are :

Question: The major products of the following reaction are : Correct Option: 1 Solution: (1)...

A solution of two components containing n1 moles of the 1st

Question: A solution of two components containing $\mathrm{n}_{1}$ moles of the $1^{\text {st }}$ component and $\mathrm{n}_{2}$ moles of the $2^{\text {nd }}$ component is prepared. $\mathrm{M}_{1}$ and $\mathrm{M}_{2}$ are the molecular weights of component 1 and 2 respectively, If $d$ is the density of the solution in $\mathrm{g} \mathrm{mL}^{-1}, \mathrm{C}_{2}$ is the molarity and $\mathrm{x}_{2}$ is the mole fraction of the $2^{\text {nd }}$ component, then $C_{2}$ can be expressed as :$\m...

The correct statement with respect to dinitrogen is:

Question: The correct statement with respect to dinitrogen is:liquid dinitrogen is not used in cryosurgery.it can be used as an inert diluent for reactive chemicals.it can combine with dioxygen at $25^{\circ} \mathrm{C}$$\mathrm{N}_{2}$ is paramagnetic in nature.Correct Option: , 2 Solution: (4) $\mathrm{N}_{2}$ is paramagnetic in nature....

An element crystallises in a face-centred cubic (fcc) unit cell with cell edge a. The distance

Question: An element crystallises in a face-centred cubic (fcc) unit cell with cell edge a. The distance between the centres of two nearest octahedral voids in the crystal lattice is$\mathrm{a}$$\sqrt{2} a$$\frac{a}{\sqrt{2}}$$\frac{\mathrm{a}}{2}$Correct Option: 3, Solution: distance between nearest octahedral voids(O.V.) $=\sqrt{\left(\frac{\mathrm{a}}{2}\right)^{2}+\left(\frac{\mathrm{a}}{2}\right)^{2}} \quad \Rightarrow=\frac{\mathrm{a}}{\sqrt{2}}$...

The INCORRECT statement is :

Question: The INCORRECT statement is :bronze is an alloy of copper and tin.brass is an alloy of copper and nickelcast iron is used to manufacture wrought iron.german silver is an alloy of zinc, copper and nickelCorrect Option: , 2 Solution: (2) brass is an alloy of copper and nickel...

The following molecule acts as an :

Question: The following molecule acts as an : AntisepticAnti-bacterialAnti-histamineAnti-depressantCorrect Option: , 3 Solution: Anti-histamine...

The lanthanoid that does NOT show +4 oxidation state is

Question: The lanthanoid that does NOT show $+4$ oxidation state isDyEuCeTbCorrect Option: , 2 Solution: (2) Eu...

The set that contains atomic number of only transition element is -

Question: The set that contains atomic number of only transition element is -$21,32,53,64$$21,25,42,72$$9,17,34,38$$37,42,50,64$Correct Option: , 2 Solution: (2) $21,25,42,72$...

The major product of the following reaction is:

Question: The major product of the following reaction is: Correct Option: , 2 Solution:...

The rate constant k of a reaction is measured at different temperatures (T), and the data are

Question: The rate constant (k) of a reaction is measured at different temperatures (T), and the data are plotted in the given figure. The activation energy of the reaction in $\mathrm{kJ} \mathrm{mol}^{-1}$ is : ( $R$ is gas constant) $2 \mathrm{R}$$R$$1 / R$$2 / \mathrm{R}$Correct Option: 1 Solution: Slope $=-\frac{E_{a}}{R}$ $-\frac{10}{5}=-\frac{E_{a}}{R}$ $\mathrm{E}_{\mathrm{a}}=2 \mathrm{R}$...

The number of molecules with energy greater than the threshold energy

Question: The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from $27{ }^{\circ} \mathrm{C}$ to $42{ }^{\circ} \mathrm{C}$. Its energy of activation in $\mathrm{J} / \mathrm{mol}$ is $($ Take $\ln 5=1.6094$ $\mathrm{R}=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ ) Solution: $\mathrm{T}_{1}=300 \mathrm{~K} \quad \mathrm{~T}_{2}=315 \mathrm{~K}$ As per question $\mathrm{K}_{\mathrm{T}_{2}}=5 \mathrm{~K}_{\mat...

Consider the following equations:

Question: Consider the following equations: $2 \mathrm{Fe}^{2+}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \times \mathrm{A}+\mathrm{y} \mathrm{B}$ (in basic medium) $2 \mathrm{MnO}_{4}^{-}+6 \mathrm{H}^{+}+5 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{x}^{\prime} \mathrm{C}+\mathrm{y}^{\prime} \mathrm{D}+\mathrm{z}^{\prime} \mathrm{E}$ (in acidic medium) The sum of the stoichiometric coefficients $x, y, x^{\prime}, y^{\prime}$ and $z^{\prime}$ for products $A, B, C, D$ and $\mathrm{E}$, re...

A soft drink was bottled with a partial pressure

Question: A soft drink was bottled with a partial pressure of $\mathrm{CO}_{2}$ of 3 bar over the liquid at room temperature. The partial pressure of $\mathrm{CO}_{2}$ over the solution approaches a value of 30 bar when $44 \mathrm{~g}$ of $\mathrm{CO}_{2}$ is dissolved in $1 \mathrm{~kg}$ of water at room temperature. The approximate $\mathrm{pH}$ of the soft drink is $\times 10^{-1}$. (First dissociation constant of $\mathrm{H}_{2} \mathrm{CO}_{3}=4.0 \times 10^{-7}$; $\log 2=0.3$; density of ...

The number of chiral centres present in threonine is

Question: The number of chiral centres present in threonine is________. Solution: Structure of Threonine is :...

The osmotic pressure of a solution of NaCl is 0.10 atm and

Question: The osmotic pressure of a solution of $\mathrm{NaCl}$ is $0.10$ $\mathrm{atm}$ and that of a glucose solution is $0.20 \mathrm{~atm}$. The osmotic pressure of a solution formed by mixing $1 \mathrm{~L}$ of the sodium chloride solution with $2 \mathrm{~L}$ of the glucose solution is $x \times 10^{-3}$ atm. $x$ is Solution: Osmotic pressure $=\pi=\mathrm{i} \times \mathrm{C} \times \mathrm{RT}$ For $\mathrm{NaCl} \mathrm{i}=2$ so $\pi_{\mathrm{NaCl}}=\mathrm{i} \times \mathrm{C}_{\mathrm...

The total number of coordination sites in

Question: The total number of coordination sites in ethylenediaminetetraacetate (EDTA ${ }^{4-}$ ) is Solution: EDTA $^{4}$ is hexadentate ligand, so its donation sites are six....

A 100mL solution was made by adding

Question: A $100 \mathrm{~mL}$ solution was made by adding $1.43 \mathrm{~g}$ of $\mathrm{Na}_{2} \mathrm{CO}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}$. The normality of the solution is $0.1$ N. The value of $x$ is (The atomic mass of $\mathrm{Na}$ is $23 \mathrm{~g} / \mathrm{mol}$ ) :- Solution: Molar mass of $\mathrm{Na}_{2} \mathrm{CO}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}$ $\Rightarrow 23 \times 2+12+48+18 x$ $\Rightarrow 46+12+48+18 x$ $\Rightarrow(106+18 x)$ Eqwt $=\frac{\mathrm{M}}{2}=(53+9 \...

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